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Conductance quantization suppression in the quantum Hall regime.

José M Caridad1, Stephen R Power2,3,4, Mikkel R Lotz2

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Conductance quantization is suppressed in graphene nanoconstrictions within the quantum Hall regime. This study experimentally demonstrates the breakdown of quantized conductance due to electrostatic interactions in low-disorder systems.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Transport

Background:

  • Conductance quantization is a key feature of electronic transport in mesoscopic systems.
  • Edge states in quantum Hall regime lead to wider conductance plateaus.
  • Electrostatic interactions can alter conductance quantization, increasing it and suppressing quantization.

Purpose of the Study:

  • To experimentally demonstrate the suppression of conductance quantization in the quantum Hall regime.
  • To investigate the role of electrostatic interactions in narrow, gated ballistic conductors.
  • To realize and study graphene nanoconstrictions with low edge roughness.

Main Methods:

  • Fabrication of graphene nanoconstrictions with low edge roughness.
  • Experimental measurement of electronic transport properties within the quantum Hall regime.
  • Analysis of conductance quantization suppression due to electrostatic interactions.

Main Results:

  • Demonstrated suppression of conductance quantization in graphene nanoconstrictions.
  • Observed an increase in conductance due to screening mechanisms.
  • Confirmed the appearance of additional conduction channels.

Conclusions:

  • Experimental evidence for the suppression of conductance quantization in the quantum Hall regime.
  • Graphene nanoconstrictions provide a viable platform for studying these effects.
  • Findings impact fundamental studies of quantum transport in 2D materials.